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Date: Tue, 6 Apr 2021 11:46:44 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Ran Wang <ran.wang_1@....com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <bgolaszewski@...libre.com>,
Michael Walle <michael@...le.cc>,
"open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] gpio: mpc8xxx: Add ACPI support
On Mon, Mar 22, 2021 at 5:31 AM Ran Wang <ran.wang_1@....com> wrote:
>
> Current implementation only supports DT, now add ACPI support.
FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: Ran Wang <ran.wang_1@....com>
> ---
> Change in v4:
> - Update error print for gpiochip_add_data() to fix wrong info. in ACPI case.
> - Update error print for devm_request_irq() to fix panic in ACPI case.
> - Add include property.h and mod_devicetable.h.
> - Correct error handling for mpc8xxx_gc->regs.
> - Replace "!(IS_ERR_OR_NULL(fwnode) || is_of_node(fwnode)))" with "is_acpi_node(fwnode)"
>
> Change in v3:
> - Recover ls1028a and ls1088a compatilbe checking logic
>
> Change in v2:
> - Initialize devtype with NULL to fix compile warning.
> - Replace of_device_get_match_data() and acpi_match_device with device_get_match_data().
> - Replace acpi_match_device() with simpler checking logic per Andy's suggestion.
>
> drivers/gpio/gpio-mpc8xxx.c | 47 ++++++++++++++++++++++++++-----------
> 1 file changed, 33 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
> index 6dfca83bcd90..4b9157a69fca 100644
> --- a/drivers/gpio/gpio-mpc8xxx.c
> +++ b/drivers/gpio/gpio-mpc8xxx.c
> @@ -9,6 +9,7 @@
> * kind, whether express or implied.
> */
>
> +#include <linux/acpi.h>
> #include <linux/kernel.h>
> #include <linux/init.h>
> #include <linux/spinlock.h>
> @@ -18,6 +19,8 @@
> #include <linux/of_address.h>
> #include <linux/of_irq.h>
> #include <linux/of_platform.h>
> +#include <linux/property.h>
> +#include <linux/mod_devicetable.h>
> #include <linux/slab.h>
> #include <linux/irq.h>
> #include <linux/gpio/driver.h>
> @@ -303,8 +306,8 @@ static int mpc8xxx_probe(struct platform_device *pdev)
> struct device_node *np = pdev->dev.of_node;
> struct mpc8xxx_gpio_chip *mpc8xxx_gc;
> struct gpio_chip *gc;
> - const struct mpc8xxx_gpio_devtype *devtype =
> - of_device_get_match_data(&pdev->dev);
> + const struct mpc8xxx_gpio_devtype *devtype = NULL;
> + struct fwnode_handle *fwnode;
> int ret;
>
> mpc8xxx_gc = devm_kzalloc(&pdev->dev, sizeof(*mpc8xxx_gc), GFP_KERNEL);
> @@ -315,14 +318,14 @@ static int mpc8xxx_probe(struct platform_device *pdev)
>
> raw_spin_lock_init(&mpc8xxx_gc->lock);
>
> - mpc8xxx_gc->regs = of_iomap(np, 0);
> - if (!mpc8xxx_gc->regs)
> - return -ENOMEM;
> + mpc8xxx_gc->regs = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(mpc8xxx_gc->regs))
> + return PTR_ERR(mpc8xxx_gc->regs);
>
> gc = &mpc8xxx_gc->gc;
> gc->parent = &pdev->dev;
>
> - if (of_property_read_bool(np, "little-endian")) {
> + if (device_property_read_bool(&pdev->dev, "little-endian")) {
> ret = bgpio_init(gc, &pdev->dev, 4,
> mpc8xxx_gc->regs + GPIO_DAT,
> NULL, NULL,
> @@ -345,6 +348,7 @@ static int mpc8xxx_probe(struct platform_device *pdev)
>
> mpc8xxx_gc->direction_output = gc->direction_output;
>
> + devtype = device_get_match_data(&pdev->dev);
> if (!devtype)
> devtype = &mpc8xxx_gpio_devtype_default;
>
> @@ -369,24 +373,29 @@ static int mpc8xxx_probe(struct platform_device *pdev)
> * associated input enable must be set (GPIOxGPIE[IEn]=1) to propagate
> * the port value to the GPIO Data Register.
> */
> + fwnode = dev_fwnode(&pdev->dev);
> if (of_device_is_compatible(np, "fsl,qoriq-gpio") ||
> of_device_is_compatible(np, "fsl,ls1028a-gpio") ||
> - of_device_is_compatible(np, "fsl,ls1088a-gpio"))
> + of_device_is_compatible(np, "fsl,ls1088a-gpio") ||
> + is_acpi_node(fwnode))
> gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
>
> ret = gpiochip_add_data(gc, mpc8xxx_gc);
> if (ret) {
> - pr_err("%pOF: GPIO chip registration failed with status %d\n",
> - np, ret);
> + dev_err(&pdev->dev,
> + "GPIO chip registration failed with status %d\n", ret);
> goto err;
> }
>
> - mpc8xxx_gc->irqn = irq_of_parse_and_map(np, 0);
> + mpc8xxx_gc->irqn = platform_get_irq(pdev, 0);
> if (!mpc8xxx_gc->irqn)
> return 0;
>
> - mpc8xxx_gc->irq = irq_domain_add_linear(np, MPC8XXX_GPIO_PINS,
> - &mpc8xxx_gpio_irq_ops, mpc8xxx_gc);
> + mpc8xxx_gc->irq = irq_domain_create_linear(fwnode,
> + MPC8XXX_GPIO_PINS,
> + &mpc8xxx_gpio_irq_ops,
> + mpc8xxx_gc);
> +
> if (!mpc8xxx_gc->irq)
> return 0;
>
> @@ -399,8 +408,9 @@ static int mpc8xxx_probe(struct platform_device *pdev)
> IRQF_SHARED, "gpio-cascade",
> mpc8xxx_gc);
> if (ret) {
> - dev_err(&pdev->dev, "%s: failed to devm_request_irq(%d), ret = %d\n",
> - np->full_name, mpc8xxx_gc->irqn, ret);
> + dev_err(&pdev->dev,
> + "failed to devm_request_irq(%d), ret = %d\n",
> + mpc8xxx_gc->irqn, ret);
> goto err;
> }
>
> @@ -425,12 +435,21 @@ static int mpc8xxx_remove(struct platform_device *pdev)
> return 0;
> }
>
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id gpio_acpi_ids[] = {
> + {"NXP0031",},
> + { }
> +};
> +MODULE_DEVICE_TABLE(acpi, gpio_acpi_ids);
> +#endif
> +
> static struct platform_driver mpc8xxx_plat_driver = {
> .probe = mpc8xxx_probe,
> .remove = mpc8xxx_remove,
> .driver = {
> .name = "gpio-mpc8xxx",
> .of_match_table = mpc8xxx_gpio_ids,
> + .acpi_match_table = ACPI_PTR(gpio_acpi_ids),
> },
> };
>
> --
> 2.25.1
>
--
With Best Regards,
Andy Shevchenko
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